Safety-valve.



H. C. MQGARTY.

SAFETY VALVE.

APPLICATION FILED DEC. 7, 1907.

Patentd Dec. 28, 1909.

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APPLICATION FILED DBO. 7, 1901.

944,809, Patented Dec. 28, 1909.

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APPLICATION FILED 1330.7, 1901.

944,809, Patented D90. 28, 1909.

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APPLICATION FILED DEC. 7, 1907.

Patente d, Dec. 28,1909.

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piTn STATES PATENT OFFICE.

HARRY C. MCCARTY, 0F WILLIAMSPORT, PENNSYLVANIA.

SAFETY-VALVE.

To all whom it may concern:

Be it known that I, HARRY C. MGCARTY, a citizen of the United States,residing in the city of Villiamsport, Lycoming county, State ofPennsylvania, have invented certain new and useful Improvements inSafety-Valves, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings, forming apart of this specification.

My invention relates to safety valves and has for its object to providemeans whereby the usual types of discharge chamber, may in substance beretained while at same time the lever and spring mechanism may beprotected against deterioration, if not destruction, from hightemperature when the valve is used to govern the pressure in steamsuperheaters.

To these ends my invent-ion consists of the combination in a safetyvalve comprising a valve casing, a valve seat, and a valve constructedwith a pop chamber between them, of a hood or casing constituting adischarge chamber, whether muffled or otherwise, a lever pivotallyconnected with the valve within the discharge chamber, with its oppositeend extending without said chamber, and a cont-rolling spring governingsaid lever, which is wholly outside the discharge chamber.

In the employment on steam superheaters, of safety valves of the generaltypes stated, wherein the valve-controlling spring is immediately abovethe valve and within the steam-discharge chamber, it has been found thatthe high temperature of the steam, in such use, would speedily draw thetemper out of the spring, rendering it unreliable and useless for thepurpose for which it was intended and destroying the sensitiveness ifnot the practical usefulness of the valve. These defects are whollyobviated by my device which is hereinafter described, the novel featuresof which will be pointed out in the appended claims.

In the accompanying drawings illustrating my invention: Figure 1 is aplan view and Fig. 2 a side elevation of one form of device exemplifyingmy invention. Fig. 3 is a front view of the same, and Fig. 4 a verticalsection thereof. Fig. 5 is a plan view and Fig; 6 a side elevation ofthe same device constructed with a mufiied discharge Specification ofLetters Patent.

Application filed December 7, 1907.

Patented Dec. 28, 1909. Serial No. 405,489.

chamber; while Fig. 7 is a front view and Fig. 8 a vertical section ofthe same.

Referring now to said drawings, 1 indicates the lower section of thevalve-casing, with its screw-threaded inlet aperture 2, to attach it tosteam piping, and it is provided as usual with the guide 3 for the stemat of the valve 5, and it has also the usual annular beveled orcountersunk valve seat (5, and the exterior screw-threaded portion 7above the lower casing l for the reception of the adjustable ring 8which has a beveled face forming the upper valve seat 9, the two valveseats 6 and 9 forming between them the usual pop chamber. Means such asscrew 8 may be employed to adjust the ring 8. The valve 5 has a centraldepending wing 4 adapted to operatively fit the guide 3, and has anannular beveled face 10 to lit the beveled valve seat 6 and anoverhanging flange 11 slightly undercut and having a beveled edge 12 toform, with its seat 9, the huddling or pop chamber.

So far as described the device is not of my invention, and may be variedin detail features without departing from my improvement which relatessolely to the discharge chamber and to the means for normally holdingthe valve to its seat. These features I will now describe.

The valve is held to its seat by means of a spring through theintervention of a vertical rod 14, the lower end of which rests directlyor indirectly on the upper surface of the valve, through a disk, andguiding devices may as usual be interposed.

Referring now to Figs. 1 to 4 inclusive it will be observed that thelower section 1 of the valve casing has an annular flange 1 upon whichrests the coinciding annular flange 15 of the upper section 16 of thevalve casing, constituting in itself the discharge chamber, which may beeither in the form of a hood with a side outlet discharge as shown inFigs. 1 to 4 or a closed mufiiing hood with perforated top, as shown inFigs. 5 to 8. Describing the former, it consists substantially of a hoodhaving the form shown in section in Fig. 4:, of a depth which, togetherwith its annular flange 15, extending below the plane of the valve andits seat, so that the valve will rise and fall wholly within the hood orupper casing 16. It is provided with a side discharge port 17 which isscrew-threaded to connect it to exhaust piping; and with a centralaperture 18 in its top wall to admit the free passage therethrough ofthe valve rod 14:, said rod having on its upper extremity a V-head 19 tocoincide with a centering slot in the lever 20. The hood 16 has castupon it, on one side, a bracket 21, suitably recessed to admit a pivotpin 22 passing through it and through the heel of the lever 30, wherebythe latter has a pivotal swing over the top of the hood 1G. The oppositeend of said lever is recessed to admit the passage through it of theupper end of the spring rod 29, a nut- 23 being employed to depress thisend of the lever and adjust the spring. The annular flange 15 of thehood or upper casing 16 has, formed upon it, at a point on itsperipheral edge, opposite to that of the lever bracket, another bracketpiece 2st to support the disk plate 25 of the coiled spring 28 and itsrod, and the pair of brace rods 26, 26, (see Figs. 1 to A likeconstruction of the hood or upper casing 16 is shown in Figs. 5 and 8,save that the side discharge is omitted, and the hood formed as a closedcasing, with a perforated top, as at 27, to form a muflied dischargechamber.

The operation of the device will be readily understood by those skilledin the art, from the description given, and it will be apparent that mynew valve will give all the beneficial results of the best types of suchvalves while its spring mechanism is adequately protected from beinginjuriously affected by excessive temperature where the device isemployed to govern the pressure in steam superheaters.

laving thus described my invention, I claim as no and desire to secureby Letters Patent 1. In a safety valve con'lprising a casing constructedin two sections having coinciding flanges by which said elements areunited, the upper section of the casing operating as a steam-dischargechamber, a valve seat mounted on the lower section, a valve operativelysupported thereon, a valve rod actuated thereby, an aperture in theupper section of the casing through which said rod passes, a bracket onsaid upper section of the casing, a lever pivoted by one end to saidbracket and bearing on said valve rod, and means between the oppositeend of the pivoted lever and the flanges of the casing to normally keepthe lever depressed and the valve closed.

2. In a safety valve comprising a sectional valve casing, anannularly-flanged lower casing, a valve therein, a superposed uppercasing, adapted to operate as a steam-discharge chamber, and having anannular flange coinciding with the flange of the lower casing, a valverod passing through an aperture in the upper casing, a bracket on theexterior wall thereof, a lever pivotally mounted in said bracket overthe projecting end of the valve rod, and spring mechanism acting on thefree end of said lever to hold the valve to its seat.

3. In a safety valve, a casing therefor con structed in two sectionshaving coinciding exterior flanges, a valve seat in the lower section, avalve seated thereon, a valve rod adapted to be actuated thereby, anaperture in the upper section through which said rod passes, said uppersection adapted to operate as a steam-discharge chamber, a leverpivotally mounted over said upper section and adapted to be actuated bysaid rod on a rise of the valve, and a spring-controlled rod between theopposite end of said lever and the flange of the upper section of thecasing operating to govern said lever to hold the valve to its seat.

4. In a safety valve comprising a sectional valve casing consisting ofan annularly-fianged lower section, a superposed upper section having anannular flange coin ciding with the flange of the lower section, a valveseat in the latter, a valve operatively mounted on said seat, a valverod actuated by said rod and passing through an aperture in the top ofthe upper section of the casing, a lever pivotally mounted by one end onsaid upper section and bearing on said valve rod, and aspring-controlled rod, exterior of the casing, adapted to hold the levernormally depressed and keep the valve to its seat.

In testimony whereof, I, have hereunto affixed my signature this fifthday of December A. D. 1907.

HARRY C. MOGARTY.

Vitnesses:

A. M. BIDDLE, H. T. FENTON.

